C#openGL画圆柱面

以下是使用C#和OpenGL绘制圆柱体的示例代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using Tao.OpenGl;
using Tao.Platform.Windows;

namespace OpenGLTutorial1
{
    class Program
    {
        static void Main(string[] args)
        {
            SimpleOpenGlControl control = new SimpleOpenGlControl();
            control.Dock = DockStyle.Fill;
            Form form = new Form();
            form.Controls.Add(control);
            form.WindowState = FormWindowState.Maximized;
            form.Load += Form_Load;
            Application.Run(form);
        }

        private static void Form_Load(object sender, EventArgs e)
        {
            SimpleOpenGlControl control = sender as SimpleOpenGlControl;
            if (control != null)
            {
                control.InitializeContexts();

                Gl.glMatrixMode(Gl.GL_PROJECTION);
                Gl.glLoadIdentity();
                Glu.gluPerspective(45, control.Width / control.Height, 0.1, 100);

                Gl.glMatrixMode(Gl.GL_MODELVIEW);
                Gl.glLoadIdentity();
                Gl.glTranslatef(0, 0, -5);

                Gl.glEnable(Gl.GL_DEPTH_TEST);

                DrawCylinder(1, 1, 2, 30, 30);

                control.Invalidate();
            }
        }

        private static void DrawCylinder(double radiusTop, double radiusBottom, double height, int slices, int stacks)
        {
            double x, y, z;
            double sliceStep = 2.0 * Math.PI / slices;
            double stackStep = height / stacks;
            double radiusStep = (radiusBottom - radiusTop) / stacks;
            double angle;

            for (int i = 0; i < stacks; ++i)
            {
                double radius = radiusTop + i * radiusStep;
                double z0 = i * stackStep;
                double z1 = (i + 1) * stackStep;

                Gl.glBegin(Gl.GL_QUAD_STRIP);
                for (int j = 0; j <= slices; ++j)
                {
                    angle = j * sliceStep;
                    x = radius * Math.Cos(angle);
                    y = radius * Math.Sin(angle);
                    z = z0;
                    Gl.glVertex3d(x, y, z);

                    x = (radius + radiusStep) * Math.Cos(angle);
                    y = (radius + radiusStep) * Math.Sin(angle);
                    z = z1;
                    Gl.glVertex3d(x, y, z);
                }
                Gl.glEnd();
            }

            Gl.glBegin(Gl.GL_TRIANGLE_FAN);
            Gl.glNormal3d(0, 0, -1);
            Gl.glVertex3d(0, 0, 0);
            for (int i = 0; i <= slices; ++i)
            {
                angle = i * sliceStep;
                x = radiusTop * Math.Cos(angle);
                y = radiusTop * Math.Sin(angle);
                z = 0;
                Gl.glVertex3d(x, y, z);
            }
            Gl.glEnd();

            Gl.glBegin(Gl.GL_TRIANGLE_FAN);
            Gl.glNormal3d(0, 0, 1);
            Gl.glVertex3d(0, 0, height);
            for (int i = slices; i >= 0; --i)
            {
                angle = i * sliceStep;
                x = radiusBottom * Math.Cos(angle);
                y = radiusBottom * Math.Sin(angle);
                z = height;
                Gl.glVertex3d(x, y, z);
            }
            Gl.glEnd();
        }
    }
}

在这个示例中，我们使用了Tao Framework来调用OpenGL库。在`Form_Load`方法中，我们首先初始化OpenGL的投影矩阵和模型视图矩阵，然后启用深度测试。最后，我们调用`DrawCylinder`方法来绘制圆柱体。

在`DrawCylinder`方法中，我们使用了四边形条带来绘制圆柱体的侧面，三角形扇形来绘制顶面和底面。我们通过循环计算每个四边形条带的顶点坐标，并调用`Gl.glVertex3d`方法来绘制它们。在绘制顶面和底面时，我们使用了三角形扇形，其中心点是圆柱体的中心点，顶点是圆柱体底面和顶面的边缘点。